cache support in knitr engine?

I am writing a knit engine for plantuml (here](https://github.com/rkrug/plantuml/blob/master/R/plantuml_knit_engine.R) ) and I would like to support the cache. I assumed it is an automatic feature, but it seems, that I have to implement it? How could I implement the cache in a knitr engine?

Thanks,

Rainer

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